ONS ONCC CHEMO RENEWAL 2026 EXAM
COMPREHENSIVE EXAM BANK 300 ACCURATE QUESTIONS &
ANSWERS (100% VERIFIED, GRADED A+)
WITH DETAILED RATIONALES
SECTION 1: CHEMOTHERAPY PRINCIPLES & PHARMACOLOGY
QUESTION 1
Which of the following best describes the mechanism of action of alkylating
agents?
A. Inhibit DNA synthesis by cross-linking DNA strands
B. Inhibit topoisomerase II enzymes
C. Cause mitotic spindle disruption
D. Inhibit purine or pyrimidine synthesis
ANSWER: A
RATIONALE: Alkylating agents (such as cyclophosphamide, cisplatin, and busulfan)
work by cross-linking DNA strands, which prevents DNA replication and
transcription, leading to cell death. They are cell cycle phase-nonspecific, meaning
they can act on cells in any phase of the cell cycle. They are particularly effective
against rapidly dividing cells.
QUESTION 2
Which chemotherapy agent is classified as an antimetabolite?
A. Doxorubicin
B. Methotrexate
C. Vincristine
D. Cisplatin
ANSWER: B
RATIONALE: Methotrexate is an antimetabolite that works by inhibiting
dihydrofolate reductase, thereby blocking the synthesis of purines and
1
,thymidylate, essential for DNA and RNA synthesis. Doxorubicin is an
anthracycline. Vincristine is a vinca alkaloid. Cisplatin is an alkylating agent.
QUESTION 3
A patient receiving cisplatin should be monitored for which significant toxicity?
A. Cardiotoxicity
B. Nephrotoxicity
C. Neurotoxicity
D. Ototoxicity
ANSWER: B
RATIONALE: Cisplatin is a platinum-containing alkylating agent with dose-limiting
nephrotoxicity (renal toxicity). Patients must receive aggressive hydration before
and after administration to protect kidney function. Other significant toxicities
include peripheral neuropathy, ototoxicity (especially tinnitus and high-frequency
hearing loss), and myelosuppression.
QUESTION 4
Which of the following is a key characteristic of cell cycle-specific chemotherapy
agents?
A. They are effective only during a specific phase of the cell cycle
B. They are effective in any phase of the cell cycle
C. They are only effective in the G0 phase
D. They work by alkylating DNA strands
ANSWER: A
RATIONALE: Cell cycle-specific agents (such as antimetabolites and vinca
alkaloids) are most effective during a specific phase of the cell cycle (S-phase for
antimetabolites, M-phase for vinca alkaloids). They require rapidly dividing cells
to be effective. Cell cycle-nonspecific agents (such as alkylating agents) can act on
cells in any phase.
QUESTION 5
2
,Which of the following chemotherapy agents is associated with dose-limiting
cardiotoxicity?
A. Bleomycin
B. Doxorubicin
C. Methotrexate
D. Cyclophosphamide
ANSWER: B
RATIONALE: Doxorubicin (an anthracycline) is associated with a cumulative dose-
limiting cardiotoxicity. The maximum lifetime cumulative dose is typically 450-550
mg/m². Cardiac monitoring (MUGA scan or echocardiogram) is recommended to
assess left ventricular ejection fraction (LVEF). The risk of cardiotoxicity increases
with higher cumulative doses.
QUESTION 6
Which of the following is a mechanism of action of taxanes (e.g., paclitaxel,
docetaxel)?
A. Inhibit microtubule depolymerization
B. Inhibit DNA synthesis
C. Inhibit topoisomerase I
D. Cause DNA cross-linking
ANSWER: A
RATIONALE: Taxanes (paclitaxel, docetaxel) work by stabilizing microtubules and
inhibiting their depolymerization, which prevents cell division during mitosis.
They are cell cycle-specific agents active in the M phase. Vinca alkaloids
(vincristine, vinblastine) also affect microtubules but work by preventing
microtubule assembly.
QUESTION 7
A patient receiving bleomycin is at risk for which specific toxicity?
A. Pulmonary fibrosis
B. Cardiotoxicity
3
, C. Nephrotoxicity
D. Ototoxicity
ANSWER: A
RATIONALE: Bleomycin is associated with dose-limiting pulmonary toxicity,
including pulmonary fibrosis. The risk increases with cumulative doses above 400
units. Baseline pulmonary function tests (PFTs) and regular monitoring are
recommended. Supplemental oxygen should be used cautiously in patients
receiving bleomycin due to the risk of pulmonary toxicity.
QUESTION 8
Which of the following is an appropriate pre-medication regimen for paclitaxel?
A. Diphenhydramine and hydrocortisone
B. Ondansetron and dexamethasone
C. Lorazepam and haloperidol
D. Ranitidine and metoclopramide
ANSWER: A
RATIONALE: Premedication with diphenhydramine (or another antihistamine) and
hydrocortisone (or other corticosteroid) is recommended for paclitaxel to prevent
hypersensitivity reactions. These reactions are caused by the vehicle (Cremophor
EL) used to dissolve paclitaxel. Premedication should be given 30-60 minutes
before the infusion.
QUESTION 9
Which of the following chemotherapy agents requires leucovorin rescue?
A. Cisplatin
B. Methotrexate
C. Doxorubicin
D. Cyclophosphamide
ANSWER: B
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COMPREHENSIVE EXAM BANK 300 ACCURATE QUESTIONS &
ANSWERS (100% VERIFIED, GRADED A+)
WITH DETAILED RATIONALES
SECTION 1: CHEMOTHERAPY PRINCIPLES & PHARMACOLOGY
QUESTION 1
Which of the following best describes the mechanism of action of alkylating
agents?
A. Inhibit DNA synthesis by cross-linking DNA strands
B. Inhibit topoisomerase II enzymes
C. Cause mitotic spindle disruption
D. Inhibit purine or pyrimidine synthesis
ANSWER: A
RATIONALE: Alkylating agents (such as cyclophosphamide, cisplatin, and busulfan)
work by cross-linking DNA strands, which prevents DNA replication and
transcription, leading to cell death. They are cell cycle phase-nonspecific, meaning
they can act on cells in any phase of the cell cycle. They are particularly effective
against rapidly dividing cells.
QUESTION 2
Which chemotherapy agent is classified as an antimetabolite?
A. Doxorubicin
B. Methotrexate
C. Vincristine
D. Cisplatin
ANSWER: B
RATIONALE: Methotrexate is an antimetabolite that works by inhibiting
dihydrofolate reductase, thereby blocking the synthesis of purines and
1
,thymidylate, essential for DNA and RNA synthesis. Doxorubicin is an
anthracycline. Vincristine is a vinca alkaloid. Cisplatin is an alkylating agent.
QUESTION 3
A patient receiving cisplatin should be monitored for which significant toxicity?
A. Cardiotoxicity
B. Nephrotoxicity
C. Neurotoxicity
D. Ototoxicity
ANSWER: B
RATIONALE: Cisplatin is a platinum-containing alkylating agent with dose-limiting
nephrotoxicity (renal toxicity). Patients must receive aggressive hydration before
and after administration to protect kidney function. Other significant toxicities
include peripheral neuropathy, ototoxicity (especially tinnitus and high-frequency
hearing loss), and myelosuppression.
QUESTION 4
Which of the following is a key characteristic of cell cycle-specific chemotherapy
agents?
A. They are effective only during a specific phase of the cell cycle
B. They are effective in any phase of the cell cycle
C. They are only effective in the G0 phase
D. They work by alkylating DNA strands
ANSWER: A
RATIONALE: Cell cycle-specific agents (such as antimetabolites and vinca
alkaloids) are most effective during a specific phase of the cell cycle (S-phase for
antimetabolites, M-phase for vinca alkaloids). They require rapidly dividing cells
to be effective. Cell cycle-nonspecific agents (such as alkylating agents) can act on
cells in any phase.
QUESTION 5
2
,Which of the following chemotherapy agents is associated with dose-limiting
cardiotoxicity?
A. Bleomycin
B. Doxorubicin
C. Methotrexate
D. Cyclophosphamide
ANSWER: B
RATIONALE: Doxorubicin (an anthracycline) is associated with a cumulative dose-
limiting cardiotoxicity. The maximum lifetime cumulative dose is typically 450-550
mg/m². Cardiac monitoring (MUGA scan or echocardiogram) is recommended to
assess left ventricular ejection fraction (LVEF). The risk of cardiotoxicity increases
with higher cumulative doses.
QUESTION 6
Which of the following is a mechanism of action of taxanes (e.g., paclitaxel,
docetaxel)?
A. Inhibit microtubule depolymerization
B. Inhibit DNA synthesis
C. Inhibit topoisomerase I
D. Cause DNA cross-linking
ANSWER: A
RATIONALE: Taxanes (paclitaxel, docetaxel) work by stabilizing microtubules and
inhibiting their depolymerization, which prevents cell division during mitosis.
They are cell cycle-specific agents active in the M phase. Vinca alkaloids
(vincristine, vinblastine) also affect microtubules but work by preventing
microtubule assembly.
QUESTION 7
A patient receiving bleomycin is at risk for which specific toxicity?
A. Pulmonary fibrosis
B. Cardiotoxicity
3
, C. Nephrotoxicity
D. Ototoxicity
ANSWER: A
RATIONALE: Bleomycin is associated with dose-limiting pulmonary toxicity,
including pulmonary fibrosis. The risk increases with cumulative doses above 400
units. Baseline pulmonary function tests (PFTs) and regular monitoring are
recommended. Supplemental oxygen should be used cautiously in patients
receiving bleomycin due to the risk of pulmonary toxicity.
QUESTION 8
Which of the following is an appropriate pre-medication regimen for paclitaxel?
A. Diphenhydramine and hydrocortisone
B. Ondansetron and dexamethasone
C. Lorazepam and haloperidol
D. Ranitidine and metoclopramide
ANSWER: A
RATIONALE: Premedication with diphenhydramine (or another antihistamine) and
hydrocortisone (or other corticosteroid) is recommended for paclitaxel to prevent
hypersensitivity reactions. These reactions are caused by the vehicle (Cremophor
EL) used to dissolve paclitaxel. Premedication should be given 30-60 minutes
before the infusion.
QUESTION 9
Which of the following chemotherapy agents requires leucovorin rescue?
A. Cisplatin
B. Methotrexate
C. Doxorubicin
D. Cyclophosphamide
ANSWER: B
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